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AD7768-1 Recommended for New Designs
The AD7768-1 is a low power, high performance, S-? analog-to-digital converter (ADC), with a S-? modulator and digital filter for precision conversion...
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AD7768-1 on Analog.com

PGA for AD7768-1

Niels

on Jan 28, 2020

Hello,

I have to measure +/-10V single ended signals up to 200kHz with the AD7768-1 (24bit resolution, 512ksps).

Now, my customer asks for a PGA with gain = 1, 2 and 4.

Which signal conditoning solution do you suggest that maintains the noise and distortion levels of the AD7768?

Regards, Niels

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0 Wa$iM

on Jan 30, 2020 1:57 PM
hi Niels

with 512 ksps the option available is a SINC5 filter whose BW is given by 0.204*512 k = 104 KHz.

Meanwhile i will get back on the scheme

thanks
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0 Niels
on Feb 3, 2020 4:09 PM in reply to Wa$iM
Wa$iM,

thank you for this hint. So I will increase the sample rate to 1Msps to achieve 200kHz, no problem.

I am aware of the fact that the AD7768-1 will reduce its output data to 16 bit at 1Msps, this is ok for my customer.

This means that the analog signal conditioning, inculding the PGA, shall provide SND and THD values good enough to preserve the ADCs performance from DC to 200kHz input frequency.

I am looking forward to your suggestions.

Regards, Niels
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0 Niels
on Mar 17, 2020 9:44 PM in reply to Niels
ping...
Anybody out there who is able to give me some suggestions according to my initial request?

Regards, Niels
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0 JellenieR

on Mar 18, 2020 6:56 AM in reply to Niels
Hi

Apologies. I will follow up the product owner and get back to you.

You can also ask someone from the ADCDriver community regarding the AFE requirement. Someone there may also assist you.

Thanks,

Jellenie
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0 JellenieR

on Mar 18, 2020 6:56 AM in reply to Niels
Hi

Apologies. I will follow up the product owner and get back to you.

You can also ask someone from the ADCDriver community regarding the AFE requirement. Someone there may also assist you.

Thanks,

Jellenie
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